Bathtub



FIG. 1 is a front elevational view, showing my new design;

FIG. 2 is a top plan view of the bathtub shown in FIG. 1;

FIG. 3 is a right side elevational view of the bathtub shown in FIG. 1,the left side being a mirror image thereof;

FIG. 4 is a perspective view of the bathtub shown in FIG. 1; and,

FIG. 5 is a rear elevational view of the bathtub shown in FIG. 1.

I claim, the ornamental design for a bathtub, as shown and described.